Louis Herthum (gebore 5 Julie 1956) is 'n Amerikaanse akteur en vervaardiger. Hy is bekend vir sy rolle in die rolprent The Last Exorcism (2010) en in die televisiereekse True Blood (2008), Longmire (2012), en Westworld (2016).
- 1997: Favorite Son
- 2001: The Ghost
- 2005: The Rain Makers
- 2006: Red Ridge
- 2006: Nola
- 2008: Mutants
- 2008: The Season Before Spring
- 2010: The Last Exorcism
- 2016: The Night Stalker
- 2017: Be Afraid
- 2018: Cadaver
- Red Menace
- The Unbelievers
- 1984: Murder, She Wrote
- 1998: Vengeance Unlimited
- 2008: True Blood
- 2012: Longmire
- 2016: Westworld
- 2016: HBO's Westworld After Show
- 1990: Grand Slam
- 2010: Journey to Promethea
- 2008: Lockjaw: Rise of the Kulev Serpent
